Carburetor



Dec. 23, 1924. 1,520,261

G. F. RITTER ET AL CARBURETOR Filed D80. 23, 1914 Patented Dec. 23, 1924.

UNITED STATES, PATENT OFFICE.

GEORGE F. AND HARRY C. 'IILLOTSON, OF TOLEDO, OHIO, ASSIGNORS TO THE TILLOTSON MANUFACTURING COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO.

CARBURE'I'OR.

. I Application filed December 23, 1914. Serial No. 878,698.

To all whom it may concern:

Be it known that we, GEORGE F. Rrrrnn and HARRY C. TILLOTSON, citizens of the United States, residing at Toledo, Lucas County, Ohio, have invented new and.use-.

ful Carburetors, of which the following is a specification.

This invention relates to carburetors. This invention has utility when incorporated for mixing air with a fluid, especially for supply to internal combustion motors, as in motor vehicle work, there being special provision for automatic increase of supply with increase in the demand. Referring to the drawings:

Fig. 1 is a medial vertical section through an embodiment of the invention in a-carburetor for gasoline engine propelled motor vehicles; 0 Fig. 2 is a fragmentary section on the line IIII Fig. 1;

Fig. 3 is a perspective detail of the auxiliary inlet valve; and

Fig. 4 is a perspective view looking down upon the carburetor.

The carburetor comprises the main housing member ormixing chamber 1 having the annular seat 2 therebelow in engagement with which the chamber 3 carrying the float 3o 4 may be locked in a plurality of angular positions as to the chamber 1. The float chamber 3 is held in position by the stem having the primary air supply passage 5 which has the threaded portion 6 engaging with the threaded portion 7 of the main housing or mixing chamber 1.

The gasket 8 provides a liquid tight joint for the bottom of the float chamber 3.. Gentrally disposed in the upwardly extending 4o portion 9 of the suppl passage 5 is the needle valve 10 control ing the supply of liquid to the u wardly extending duct 11 having the ra iating ports 12 delivering transversely of the portion 9 of the primary air supply passage. The liquid from the float chamber 3 is supplied bythe duct 13 to the valve 10. The valve 10 may be adjusted by the stem 14 therebelow. The gasket15 is held in position by the gland 16 to to make a liquid tight joint for the needle valve adjustment.

The portion 9 of the primary air supply jacketing the exhaust from the intern'al combustion motor and leading air heated by the exhaust through the duct 20 and passage 21 to pass around the outside of the first venturi section 18 and mix with the enriched primary air in the second venturi section 22 in delivery to the mixing chamber 1. This section 22 is provided with an enlarged intake portion 23 directing the warmed air,

from the passage 21 for nicely commingling w1th the unheated primary air. This second venturi may have a close fit in the housing 1. The throttle valve 24: may be manipulated by the crank 25. m

In starting, to insure a. rich mixture, the warmed air in the duct 20 may be cut oil by the valve 26 as actuated by the crank 27. In normal operation at varying speeds the supply of fuel to an internal combustion motor varies over a very wide range and the problem is to furnish an economical mixture to meet these conditions. Accordingly, in the device of this disclosure, besides the transverse fuel delivery in the primary assage for effective mixing, there is supp ied the warmed air for assisting in vaporization under normal operation; while with increased volume demand from the motor, automatic response may be had thereto through the reed or spring leaf valve 27 having its free end adjacent the taper section 28 of the mounting member 29. This leaf 27 is held bythe screw 30 in the head 31 of the member 29 mounted in position as to the housing 1 by the screws 32. This automatic leaf or reed valve 27 normally closes the opening 33 from the warmed air supply passage 20. As the engine speeds up or the demand n the carburetor is for 'mcreased volume to such an extent as to reduce the pressure in the mixing chamber 1 beyond a determined degree for which the carburetor may be designed or set, the valve 27 will open and supply warmed air to supplement the primary supply as assisted by the supply from passage 21. Should this supplementary or tertiary supply of warm air be a demand of some volume the flow thereof through the passage 33 and over the ledge 28 will draw up fuel through the duct 34: from the float chamber 3 and thus automatically enrich this auxiliary air supply and thereby provide the motor with a proper combustion mixture for effective operation.

In some instances of operation where in the speeding up of the motor there is not the power demand thereon or'in somevwarm season operations, this enriching of the sup plementary or auxiliary air supply may not be necessary to insure a mixture and for eliminating such supply, there is provided a valve member 35 for closing the passage 34:. This valve member 35 has the disk 36 on its face provided with cross grooves 37 and may be rotated by the handle 38 to bring either of said grooves in line with the spring holding pointer 39 which will hold the valve in the closed or open position as desired.

The clamp ears 40 are in position to carry a guide for manipulating the crank 27 and controlling the warm air supply. The warmed air supply passage 20 is to advan- 'tage deflected as shown to permit convenient mounting as to the exhaust passages and fuel supply connections of a motor. The various angular positions in which the float chamber 3 may be placed allow most advantageous positioning of the supply chamber 41 in caring for the fuel supply line thereto.

Any condensation in the mixing chamber 1 may drain off through the passages 42 and have re-entrance for vaporization by the warm auxiliary air from the passage 21 supplied to the venturi 22.

In operation, the carburetor may have its liquid fuel supply thereto through the float controlled valve in the chamber 41. With the sup 1y of liquid fuel in the float chamber 3, t e starting of the motor will cause an inrush of primary normal atmospheric air through the passage 5, which in entering the throat 17 at the increased velocity will draw out of the laterally extending ports 12 the liquid fuel, which in its flow being directed transversely of the inrushing primary air thoroughly permeates said air volume and asentrained thereby rises in the venturi 18 expanding in such travel to approach vaporization, which is assisted by the warmin action of the air in the passage 21. ThlS rich mixture is thus subject to the inrushing warm or secondary air from the passage 21 and is directed by the portion 23 of the venturi 22 to effectively bring about thorough vaporization in the venturi 22 delivering to the mixing chamber 1 directly below the throttle 24.

In starting, it may be desirable to have instead of this normal mixture a rich mixture which may be accomplished by shutting off the secondary air by means of the valve 26. The increased volume demand upon the carburetor beyond the capacity of the primary passage 5 gradually reduces the pressure in the mixing chamber 1, and the valve 27 is thereby unbalanced admitting a tertiary air supply to supplement the mixture in the combustion chamber 1. With just a slight volume of this supplementary warmed air supply, there will not be suction sufficient to draw any enriching fuel through the passage 34 but with increased volume there is the automatic pulling of enriching fuel to commingling with the warmed air by spraying or jetting against the reed or leaf valve and being drawn through into the mixing chamber by this inrushing volume.

There is accordingly provided in this carburetor a device which will economically operate under a wide range of conditions and thereby cooperate with a motor for- "not cut off the air but leaves the primary air supply passage 5 open to supply through the venturi 18 a rich fuel mixture to the mixing chamber 1 as supplied by the fuel delivery ports 12. This rich mixture from the venturi 18 is the richmixture passing the throttle valve 241 when the valve 26 is closed as the second venturi 22 does not operate to dilute or reduce the richness of this mixture. Under these circumstances, the choking of the air at the only place that the air is to be choked at the valve 26, does not completely out off the air supply because there is the air supply through the passage 5, and so it is not possible to flood the motor with fuel and no air to assist in combustion.

What is claimed and it is desired to secure by LettersPatent is:

1. A carburetor comprising the combination of a mixing chamber, a primary fuel and air supply passage communicating with said mixing chamber and continuously open for the passage of air therethrough, an auxiliary air supply passage communicating with said mixing chamber, an automatically operable air intake valve controlling the communication between said auxiliary passage and said mixing chamber, a choke valve in said auxiliary passage, and a passage connecting said auxiliary passage with said primary passage and opening into said auxiliary passage between said air intake valve and said choke valve.

2. A carburetor comprising the combination of a mixing chamber, a primary fuel and air supply passage communicating with said mixing chamber, an auxiliary air supply passage communicating with said mixing chamber, an auxiliary fuel nozzle located in said auxiliary air supply passage, a flexible reed rigidly secured at one end and having its free end extending toward said primary supply passage, said flexible reed controlling communication between said auxiliary passage and said mixing chamber, and a passage connecting said auxiliary passage withsaid primary supply passage for conducting air to the said primary supply passage independently of the operation of the reed valve.

3. A carburetor comprising the combination of a mixing chamber, a primary fuel and air supply passage communicating with said mixing chamber, an auxiliary air supply passage separate from said primary supply and communicating with said mixing chamber, afiexible valve mounted to control the communication between said mixing chamber and said auxiliary passage and having its free end extending towards said primary supply passage, and a passage connecting said auxiliary passage and said primary passage in advance of said mixing chamber.

4. A carburetor, embodying a continuously open primary fuel and air supply passage, a chamber with which said passage communicates, an auxiliary air supply pas sage having therein a valve, a duct leading from said auxiliary passage in advance of the valve, said duct being in communication with the primary passage in advance of its point of communication with the chamber, and means for closing said auxiliary supply passage in advance of said duct.

5. A carburetor, embodying a primary air supply passage, means for supplying fuel to said passage, a supplemental air supply passage, means for supplying fuel to said supplemental air supply passage, and

a secondary air supply passage for reducing richness of the mixture of the primary supply passage, said secondary passage leading from the supplemental air supply passage.

6. A carburetor embodying a primary air supply passage, means for supplying fuel to said passage, a supplemental air supply passage, means for supplying fuel to said supplemental air supply passage, a sec-v ondary air supply passage communicating directly with said primary air supply passage for reducing the richness of the mixture of the primary air supply passage,

independent from said and common means for controlling the volume of air to be admitted to the supplemental air supply passage andto the secondary air supply passage.

7. In a carburetor, a primary air and fuel supply passage, a secondary air sup ly passage, separate and independent from said 'PF ary air supply passage, a supplemental the secondary air sup air supply passage, ply passage being connected with the supplemental supply passage and the primary fuel supply passage, and common means for controlling the admission of air to said secondary air supply passage and to said supplemental air supply passage.

8. In a carburetor, a primary air supply passage of venturi form, a fuel supply means therefor, a second venturi provided with a throat into which said first mentioned venturi delivers, a secondary air supply for said second venturi, separate and primary air supply passage, a valve for controllin ondary air supply passage, an a supplemental air and fuel supply passage opening above the-second, venturi for admitting fuel when suction is increased in the carburetor.

9. In a carburetor, a rimary air supply passage of venturi orm, a fuel supply therefor, said air supply passage being continuously open, a second venturi into which said first mentioned venturi delivers, a mixing chamber located above said second venturi, the second; venturi being said sec-' provided with openings for conducting the condensed portion ofthe fuel from the mix-- ing chamber to the primary air passage, a secondary air supply for said second venturi separate from said p imary air passage, a valve for controlling said secondary air supply passage, and a supplemental air and fuel supply passage."

10. In a carburetor, a primary air supply passage of venturi form, a fuel supply means therefor, a second venturi into which said first mentioned venturi delivers, a secondary air supply passage to said second venturi, separate from said primary air supply passa e, a supplemental air supply passage, an common means for con-. trolling the supply of air to the secondary supply passage and the supplemental supfuel supply passage, a supplemental air and In testimony whereof we aflix our signasupply passage, and a secondary air suptures in the presence'of two witnesses. ply passage having a common inlet with the GEORGE F. RITTER. supplemental air supply passage and open- HARRY C. ,TILLOTSON.

5 ing into the path f the vaporized fuel Witnesses:

from the primary supply passage before it GEO. E. KIRK, joins the supplemental supply passage. GLADYS JAMESON 

